What Nascar Nurse said. ^^
FWIW, I don't think most DONs mean to be overbearing or intimidating. We are nurses who started out just like you, fresh graduates who had heads full of book-learning and little practical experience of what it is to be a nurse. If we are intense sometimes, it's not because we don't like you or trying to make you fear us; it's because we want to make sure you're learning your job well and doing things correctly.
We know you'll make mistakes; we still do too! But we have a lot on our plates, like NN said above, which goes beyond what the floor nurses have on theirs. We aren't responsible for only our own practice, we have to make sure we've trained our staff properly, deal with families, do endless paperwork, and be the go-to person when surveyors are in the building. And that doesn't even begin to cover scheduling, handling call-ins, working extra shifts when no one's available to work, trying to control outbreaks of Norovirus and scabies, and more.
Now that you know a little more about what your DON has to cope with on an average day, perhaps you can try giving her the benefit of the doubt. Instead of overbearing, she might
just be stressed out....and it does wonders for a manager when a staff member asks her how SHE is doing.